| 琼东南盆地深水区构造热演化特征及其影响因素分析 |
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| 引用本文： | 王振峰,施小斌,杨军,黄保家,孙珍,WANG Yahui,蒋海燕,于传海,杨小秋. 琼东南盆地深水区构造热演化特征及其影响因素分析[J]. 海洋学报(英文版), 2014, 33(12): 107-117. DOI: 10.1007/s13131-014-0580-9 |
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| 作者姓名： | 王振峰 施小斌 杨军 黄保家 孙珍 WANG Yahui 蒋海燕 于传海 杨小秋 |
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| 作者单位： | 中海石油(中国)有限公司湛江分公司, 湛江 524057;中国科学院边缘海重点实验室, 中国科学院南海海洋研究所, 广州 510301;中国科学院边缘海重点实验室, 中国科学院南海海洋研究所, 广州 510301;中国科学院大学, 北京 100039;中海石油(中国)有限公司湛江分公司, 湛江 524057;中国科学院边缘海重点实验室, 中国科学院南海海洋研究所, 广州 510301;中海石油(中国)有限公司湛江分公司, 湛江 524057;中国科学院边缘海重点实验室, 中国科学院南海海洋研究所, 广州 510301;中国科学院边缘海重点实验室, 中国科学院南海海洋研究所, 广州 510301;中国科学院大学, 北京 100039;中国科学院边缘海重点实验室, 中国科学院南海海洋研究所, 广州 510301 |
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| 基金项目： | the National Science and Technology Major Programs of China under contract No. 2011ZX05025-002-01; the National Natural Science Foundation of China under contract Nos 41176050 and 41376059. |
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| 摘 要： | To reveal the tectonic thermal evolution and influence factors on the present heat flow distribution, based on 154 heat flow data, the present heat flow distribution features of the main tectonic units are first analyzed in detail, then the tectonic thermal evolution histories of 20 profiles are reestablished crossing the main deep-water sags with a structural, thermal and sedimentary coupled numerical model. On the basis of the present geothermal features, the Qiongdongnan Basin could be divided into three regions: the northern shelf and upper slope region with a heat flow of 50–70 m W/m2, most of the central depression zone of 70–85 m W/m2, and a NE trending high heat flow zone of 85–105 m W/m2 lying in the eastern basin. Numerical modeling shows that during the syn-rift phase, the heat flow increases generally with time, and is higher in basement high area than in its adjacent sags. At the end of the syn-rift phase, the heat flow in the deepwater sags was in a range of 60–85 m W/m2, while in the basement high area, it was in a range of 75–100 m W/m2. During the post-rift phase, the heat flow decreased gradually, and tended to be more uniform in the basement highs and sags. However, an extensive magmatism, which equivalently happened at around 5 Ma, has greatly increased the heat flow values, and the relict heat still contributes about 10–25 m W/m2 to the present surface heat flow in the central depression zone and the southern uplift zone. Further analyses suggested that the present high heat flow in the deep-water Qiongdongnan Basin is a combined result of the thermal anomaly in the upper mantle, highly thinning of the lithosphere, and the recent extensive magmatism. Other secondary factors might have affected the heat flow distribution features in some local regions. These factors include basement and seafloor topography, sediment heat generation, thermal blanketing, local magmatic injecting and hydrothermal activities related to faulting and overpressure.
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| 关 键 词： | 构造热演化 盆地分析 影响因素 深水 热流分布 琼东南盆地 地热特征 海底地形地貌 |
| 收稿时间： | 2014-06-20 |
| 修稿时间： | 2014-09-29 |
Analyses on the tectonic thermal evolution and influence factors in the deep-water Qiongdongnan Basin |
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| WANG Zhenfeng,SHI Xiaobin,YANG Jun,HUANG Baoji,SUN Zhen,WANG Yahui,JIANG Haiyan,YU Chuanhai and YANG Xiaoqiu. Analyses on the tectonic thermal evolution and influence factors in the deep-water Qiongdongnan Basin[J]. Acta Oceanologica Sinica, 2014, 33(12): 107-117. DOI: 10.1007/s13131-014-0580-9 |
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| Authors: | WANG Zhenfeng SHI Xiaobin YANG Jun HUANG Baoji SUN Zhen WANG Yahui JIANG Haiyan YU Chuanhai YANG Xiaoqiu |
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| Affiliation: | 1.Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang 524057, China2.Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China3.Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;University of Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | To reveal the tectonic thermal evolution and influence factors on the present heat flow distribution, based on 154 heat flow data, the present heat flow distribution features of the main tectonic units are first analyzed in detail, then the tectonic thermal evolution histories of 20 profiles are reestablished crossing the main deep-water sags with a structural, thermal and sedimentary coupled numerical model. On the basis of the present geothermal features, the Qiongdongnan Basin could be divided into three regions: the northern shelf and upper slope region with a heat flow of 50-70 mW/m2, most of the central depression zone of 70-85 mW/m2, and a NE trending high heat flow zone of 85-105 mW/m2 lying in the eastern basin. Numerical modeling shows that during the syn-rift phase, the heat flow increases generally with time, and is higher in basement high area than in its adjacent sags. At the end of the syn-rift phase, the heat flow in the deepwater sags was in a range of 60-85 mW/m2, while in the basement high area, it was in a range of 75-100 mW/m2. During the post-rift phase, the heat flow decreased gradually, and tended to be more uniform in the basement highs and sags. However, an extensive magmatism, which equivalently happened at around 5 Ma, has greatly increased the heat flow values, and the relict heat still contributes about 10-25 mW/m2 to the present surface heat flow in the central depression zone and the southern uplift zone. Further analyses suggested that the present high heat flow in the deep-water Qiongdongnan Basin is a combined result of the thermal anomaly in the upper mantle, highly thinning of the lithosphere, and the recent extensive magmatism. Other secondary factors might have affected the heat flow distribution features in some local regions. These factors include basement and seafloor topography, sediment heat generation, thermal blanketing, local magmatic injecting and hydrothermal activities related to faulting and overpressure. |
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| Keywords: | northern continental margin South China Sea surface heat flow magmatism |
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